A Republican pollster highlighted the contrast between president Joe Biden’s behind-the-scenes negotiations to secure the release of American hostages from Russia and Donald Trump’s “grumpy” social media criticism of the prisoner swap. Biden finalized the agreement to release Wall Street Journal reporter Evan Gershkovich and former U.S. Marine Paul Whelan, along with other prisoners held in Russia, about an hour before he announced that he would end his re-election campaign, and Trump insisted he could have gotten a better deal – although his former rival asked why he didn’t when he was in off…