( CNN ) -- After a campaign season that seems to have gone on for years , the day has finally arrived . On Tuesday , America will select a president of the United States , about a third of the Senate and a new House of Representatives . We invited CNN contributors to tweet their predictions . One of the first CNN contributors to announce his prediction on Twitter was Alex Castellanos . In his latest column , he explains why he 's betting fellow Republican Mitt Romney will win . Democratic strategist Paul Begala disagrees with Castellanos ' prediction . Right after the first presidential debate in which some were underwhelmed by President Barack Obama 's performance , Begala remarked , `` There is no doubt Romney had a good night . But I strongly doubt whether it was good enough . '' Begala 's tweet reflects his prediction of a narrow win for Obama . Castellanos and Begala saw each other 's predictions and plan to duel it out with a wager . Stay tuned to see who has to shave his moustache or grow one . Hilary Rosen , a Democratic strategist , is positive about the outcome for her party . Politics : Long lines , sporadic snags in U.S. election . Ari Fleischer , former White House press secretary in the George W. Bush administration , suspects that the election wo n't end Tuesday night -- that seven states could be decided by one percentage point or less . And if Romney can take Pennsylvania and Ohio , it `` would be icing on the cake . '' John Avlon , a contributor to `` Erin Burnett OutFront , '' said Sunday that the stakes are especially high in this election . Regardless of who wins , he says , `` We can not continue to allow extreme partisan distortions to define our policy debates and paralyze our capacity for constructive self-government . '' Avlon said he thinks Democrats have an edge . Politics : Why elephants ? Election riddles solved . Maria Cardona , former communications director for the Democratic National Committee , sees Obama getting the Latino vote . Conservative William Bennett , who believes that `` Romney has proven himself the man to lead America 's comeback , '' predicts that victory will also go to his candidate . David Gergen , who has been an adviser to four presidents , notes that polls indicate the president got an important bump off of Hurricane Sandy . LZ Granderson , a CNN regular , makes a case for why he 's rooting for Obama , saying that while the incumbent is not perfect , his concern for those less fortunate makes him worthy of a second term . Across the Atlantic , English historian Timothy Stanley offers his thoughts on the American election . The opinions expressed in this commentary are solely those of the authors .
CNN contributors tweeted their predictions on who will win on a campaign season . Mitt Romney predicts President Obama will be re-elected with 271 electoral votes . Obama thinks Hilary Rosen will win with a minimum of 271 electoral votes . Readers : Who do you think will win ? Offer us your predictions on @ CNNOpinion .