WASHINGTON - Presidential candidates may solicit contributions for a general election campaign even if they later decide to take public money for the race, federal regulators said Thursday in a proposed opinion. The draft document, which would have to be approved by the Federal Election Commission, was in response to a request for FEC advice from Democratic presidential candidate Barack Obama (news, bio, voting record), the Illinois senator. If a majority of the six election commissioners support the opinion, candidates would have yet another incentive to seek double contributions this early in the presidential election cycle. Any candidate who then...