As political alliances go, the four-year marriage between Gov. Bill Richardson and the Democratic Governors Association was golden. Richardson got prestige, coast-to-coast travel and national exposure that would help fuel his presidential bid, while the DGA basked in his growing notoriety and fundraising prowess. "It's been very beneficial," Richardson acknowledged in late 2006, when his stint with the political group — as federal liaison, vice-chair and unprecedented two years as chairman — wrapped up a month before he launched his unsuccessful quest for the White House. Now, that political shine could be tarnishing. Recent news reports say authorities have asked...