“Take a deep breath and dig deeper into the data. bymandesigns/Thinkstock Early general-election polls have been released, and liberals are freaking out . Donald Trump is almost dead even with Hillary Clinton in the RealClearPolitics average of national surveys, upending assumptions that the race wouldn't be close. Some Democrats are denouncing the polls as skewed. Others are sinking into panic or fatalism. Will Saletan writes about politics, science, technology, and other stuff for Slate . He's the au...”