The results:
Ohio:The best news of the night is that Democrats turned out in huge numbers in all four states (even battling the elements in Ohio, apparently). If they are able to get those voters back to the polls in November (especially among the hispanic electorate), then it shouldn't be all that hard to beat Sen. McCain in November.
Clinton 54%
Obama 46%
Rhode Island:
Clinton 58%
Obama 41%
Uncommitted 1%
Texas:
Clinton 51%
Obama 49%
Vermont:
Obama 60%
Clinton 38%
As for the all important delegate count, Obama still has a comfortable lead. The math is still being worked out, but a cursory glance shows Clinton winning 185 delegates in the four contests last night and Obama winning 184. Despite losing Texas by a small margin, the state's formula for delegate assignment helped him tremendously. Overall that gives Obama a rough total of 1,307 delegates to 1,175 for Clinton.
Adding last night's four states to the mix, Obama still leads in the national popular vote:
Obama 52%
Clinton 48%
If you include the vote in the non-binding Florida primary, he still leads:
Obama: 50.5%
Clinton: 49.5%
Since only one name appeared on the ballot in the unofficial Michigan primary, those numbers are not counted.