Democratic governors from three states in the so-called blue wall that is key to their party’s aspirations for an electoral college victory delivered closing pitches for Kamala Harris on Sunday as their presidential nominee celebrated her 60th birthday with a visit to church. Josh Shapiro of Pennsylvania, Tony Evers of Wisconsin and Michigan’s Gretchen Whitmer barnstormed the Sunday morning political shows to talk up the vice-president’s policy agenda – and highlight differences with Republican candidate Donald Trump, 16 days before an election that polls suggest is still on a knife edge. Acolytes of Trump, meanwhile, attempted to defend the former president’s extraordinary and vulgar rhetoric during a Saturday night rally in Pennsylvania, when he called Harris a “shit vice-president” and exalted the size of the late golfer Arnold Palmer’s penis. “I don’t want to go back to Donald Trump when he was in charge of the country,” Shapiro told NBC’s Meet the Press. “Remember the record? I know there’s still some people that have maybe a little brain fog, they don’t remember what it was like under Donald Trump. You had more chaos, you had less jobs, and you had a whole lot less freedom. “I don’t think we want to go back to a time of chaos. I want a stable, strong leader, and that’s Kamala Harris.” It also emerged Sunday that Harris has no plans to campaign with Joe Biden before election day on 5 November, a development appearing to confirm recent reports of friction between the two after the 81-year-old president was pressured out of running for re-election over age-related questions. “The most important role he can play is doing his job as president,” an anonymous White House official told NBC News, which said the decision was mutual following discussions between the campaign and Biden administration officials. Shapiro joined Evers and Whitmer, his fellow passengers on a weekend blue wall bus tour, for a joint interview on ABC’s This Week, in which the three spoke of polls showing the presidential race virtually deadlocked in all three states. “Both candidates believe that Pennsylvania is critical – I just think we’ve got a better candidate, a better message, and what we’re experiencing is a whole lot more energy,” Shapiro said. In Michigan, according to Whitmer, voters were comparing both candidates’ records ahead of the 5 November election. “While this is going to be close, I’d much rather be playing our hand in theirs,” she said. “We got a better candidate. We’ve got receipts on the issues that matter to the American people, on the economy, individual rights, affordable housing, and we got a better ground game.” Evers, a two-term governor, pushed back on Trump’s claims that a Harris administration would tank the US economy, using Democratic policies in Wisconsin as an example. “We have the best economy we’ve ever had, the largest budget we’ve ever had, and we’re in good shape, and people are making more money than they ever made. So we’re in a good place, and it had nothing to do with Donald Trump,” he said. The swing state governors were speaking as Harris rallied Black voters in another swing state, Georgia, on Sunday with “souls to the polls” visits to two community churches. “What kind of country do we want to live in – a country of chaos, fear and hate, or a country of freedom, compassion and justice?” she told the congregation of the New Birth Missionary Baptist church in Atlanta. “The great thing about living in a democracy is that we, the people, have the power to answer that question. So let us answer not just through our words, but through our actions and with our votes.” Harris has been attempting to shore up support from the Black community, particularly Black men. Polls have warned of a lack of enthusiasm for her campaign, though newer polling from the Howard Initiative on Public Opinion found Harris had built a lead among Black voters in swing states. Singer Stevie Wonder was scheduled to join her later at a rally at the Divine Faith Ministries International in Jonesboro. That gathering was set to occur ahead of Harris’s interview with civil rights leader Al Sharpton to be broadcast later Sunday on MSNBC. “We just have to keep doing the work,” Georgia US senator Raphael Warnock – a Black Democrat – said on CBS’s Face the Nation on Sunday. “And the good news is – that’s exactly what Kamala Harris [is] … doing.” Trump remained in Pennsylvania for an afternoon rally in Lancaster and a photo-op at a McDonald’s restaurant, the day after his bizarre appearance in Latrobe, Palmer’s home town, in which he riffed at length – in an unrefined address – about how well endowed the golfer was with respect to his genitalia. Republicans appearing on the Sunday talk shows attempted to detract from Trump’s comments and other recent behavior, including suggesting in an interview this week he would use the US military against political enemies. The South Carolina senator Lindsey Graham lost his composure when questioned about it on NBC’s Meet the Press – and tried to pivot to two recent assassination attempts on Trump, both conducted by pro-Republican persons. “When you talk about rhetoric, you gotta remember they tried to blow his head off,” Graham said. “He’s been shot at and hit in the ear, and we’re lucky they didn’t blow his head off. And another guy tried to kill him … so I’m not overly impressed about the rhetoric game here.” Graham also condemned Republican colleagues, including former members of Congress Liz Cheney and Adam Kinzinger, as well as numerous ex-Trump administration officials who have denounced him and expressed support for Harris. The retired general Mark Milley, the former chair of the joint chiefs of staff, called Trump “fascist to the core”, according to veteran journalist Bob Woodward’s new book War. “To every Republican voting for her, what the hell are you doing?” Graham said. “You’re supporting the most radical nominee in the history of American politics. When you support her, you’re supporting four more years of garbage policy.” US House speaker Mike Johnson, a Louisiana Republican, was more restrained – but equally as determined to avoid questions about Trump’s commentary in an appearance on CNN’s State of the Union, suggesting that it was host Jake Tapper who was obsessed with talking about Palmer’s penis. “The media can pick it apart, but people are going to vote what’s best for their family and they see that in Trump,” he said. Early in-person voting is under way in numerous states, with voters in Georgia setting a first-day turnout record Tuesday, even as polls have the candidates in a virtual dead heat. Shapiro said winning over the remaining undecided voters would determine the winner. “There are people that, frankly, don’t follow this on a daily basis, people that don’t follow the polls. They go to work, they got kids at home, they do their job with their kids and get up the next day,” he said. “The polls look at a small number. I know it’s a science, but at the end of the day I run into people all the time who just haven’t given it a thought, so we’re going to help them.”