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VATICAN CITY -- Cardinals are set to gather again later today for more voting on day two of their conclave to elect a new pope.

Black smoke poured out of the Sistine Chapel's chimney this morning after two rounds of voting failed to reach the two-thirds majority needed to choose a pope.

It's the second time since conclave began that black smoke came out.

The smoke was seen yesterday after the first round of voting ended with no new pope.

Now with speculation mounting, some candidates could be moving to the top of the list.

They include Cardinal Angelo Scola of Milan, Cardinal Odilo Pedro Scherer of Brazil, and Cardinal Marc Ouellet of Canada.

An American shadow candidate like New York's Cardinal Dolan or Cardinal Sean O'Malley of Boston could also slip in if there's no consensus on anyone else. As a result, the third and fourth rounds of voting are considered important.

"The issue is not just who gets more votes, but who might plateau. And if they plateau and don't get beyond 51, 52, then who do we go to? And then you've got the other contenders who might not be quite as obvious as the ones we see in the press."

The balloting process will continue each day until a candidate at least 77 votes.

If no pope is elected by Friday, the cardinals will take Saturday off before resuming on Sunday.