Without a doubt they are. Democrats aren't antisemitic, but they're tolerant of it within their political organization. Irrespective of what you think of Pat, he's not a Republican. Hasn't been for over a decade. To anyone but the media.
Well, not to paint with a broad brush, but I don't recall any Republican (other than Buchanan, who, as you said, has left the GOP because he's not welcome) running for or serving as president or running for or serving in either house of Congress making an antisemitic remark or gesture publicly in my lifetime. Contrast that with Jesse Jackson, Al Sharpton, James Moran, Hillary Rodham Clinton, Ernest Hollings, the afformentioned John Dingell, Charlie Rangel, Cynthia McKinney, Ron Dellums, Gus Savage, and a list almost too long to spell out.