The debate over legalizing marijuana for medical and even recreational purposes is blurring conservative and liberal lines. With polls showing a slight majority of Americans now supporting the legalization of the drug, especially younger voters, and billionaire campaign financiers such as George Soros funding the pro-pot movement, a number of candidates are finding themselves at odds with their own party's positions. Ari Fleischer, a White House press secretary for President George W. Bush, called marijuana "a sleeper issue," in the upcoming campaign and noted its trickiness, telling The Wall Street Journal, "All of a sudden the ground is shifting, and...