Poll of polls: Race tightens in Pennsylvania

(CNN) — The Democratic presidential race is tightening in the key state of Pennsylvania, according to a new CNN analysis of recent polls there.

In the latest CNN "poll of polls," Hillary Clinton now holds a 7 point lead over Obama, 49 percent to 42 percent. Nine percent remain unsure of their vote.

That gap is 4 points narrower than a similar CNN poll of polls conducted Friday. In that average, Clinton held an 11 point lead, 51 percent to 40 percent.

The most recent poll of polls included recent surveys from the American Research Group, Muhlenberg College, and Quinnipiac University.

A decisive win in Pennsylvania's April 22 primary vote is seen as crucial for Clinton as she seeks to finish the primary season with enough momementum to convince the party's undecided superdelegates to give her the nomination.