Obama's negative campaign will go into overdrive, now that Romney has announced that his running mate will be Wisconsin Congressman Paul Ryan. Democrat's scare tactics have already begun.
A side question is how Romney's choice will affect the Jewish vote, which has not been as strongly pro-Obama as in the 2008 election. While there's no reason to see Ryan as an actual draw for Jewish votes, there is the question--as Jonathan Tobin writes: Will Ryan Help Obama Win Jewish Votes?: