(cnn) - (CNN) -- Wisconsin and Hawaii become the latest battlegrounds in the struggle for the Democratic presidential nominee Tuesday, while Republican Sen. John McCain is looking for victories to finally knock his last remaining major rival out of the race.

In the Democratic presidential race, Sen. Barack Obama is looking to increase his lead over Sen. Hillary Clinton in the race for delegates with wins in the Wisconsin primary, one of the nation's oldest, and the Hawaii Democratic caucuses, the state were the Illinois senator was born and where he still has family. Read More