Today's contests
Kentucky Democratic primary
Voting: 6 a.m. to 6 p.m. EDT (polls close at 7 p.m. EDT in western counties in Central time zone)
At stake: 51 pledged delegates
The race: The state appears to be Hillary Clinton country in its demographics: 88 percent of residents are white, and they are poorer and less educated than the national average. Only registered Democrats can vote, a rule that fences out independents who have been less friendly to Clinton. And unlike in other states, there has not been a huge surge in new voters, who tend to favor Barack Obama. It's unlikely, though, that Clinton can pull off a landslide. She is leading by 25 to 35 percentage points in recent polls.
Oregon Democratic primary
Voting: 10 a.m. to 11 p.m. EDT
At stake: 52 pledged delegates
The race: Obama is counting on a victory to give him a majority in pledged delegates - a key milestone to the nomination. The state's liberal leanings and collection of college towns bode well for Obama, but the eastern part of Oregon is more conservative and conducive to Clinton. Oregon is the only state that votes entirely by mail, though the ballots won't be counted until today, and the turnout has been heaviest in expected Obama strongholds. Obama drew the biggest crowd of his campaign so far in Portland on Sunday - an estimated 65,000 to 75,000 - and leads in most polls by double digits. 