(CNN) - Hillary Clinton appears to have taken a clear lead in the crucial primary state of Indiana while Barack Obama remains ahead in Tuesday's other big prize - North Carolina.
According to new CNN surveys of several recent polls out of both states, Clinton's lead increased in Indiana while Obama remained the frontrunner in North Carolina - albeit by single digits.
A CNN poll of polls in Indiana shows Clinton now leads Obama there by four points among likely Democratic voters, 48 to 44 percent. Eight percent of voters there remain undecided. That lead is up from several recent surveys of polls that showed Clinton and Obama locked in a dead heat in Indiana.
Meanwhile, several new North Carolina polls indicate Obama holds a clear lead in North Carolina. The CNN poll of polls shows Obama with an 8-point edge, 50 to 42 percent. That margin is exactly the same as it was in a similar CNN poll of polls conducted last week. But Obama had long held a double-digit lead in the state, and is considered the clear favorite given North Carolina's demographics.
Indiana and North Carolina are considered crucial contests for both candidates. An Obama sweep would effectively establish the Illinois senator as the party's presumptive Democratic nominee while two victories for Clinton would give the New York senator a fresh boost of momentum ahead of the race’s final stretch.
On the national front, Obama holds a slight edge over Clinton. A CNN poll of polls shows Obama with a 4-point lead over Clinton nationwide - that margin is slightly higher than it was in a poll of polls last week that showed Obama with a 2-point lead.