Two years ago, President Obama was striding the beaches of New Jersey and spearheading the federal response to the damage wrought by Hurricane Sandy. Gov. Chris Christie was praising the president and Washington's help for his battered state -- much to the dismay of his fellow Republicans.Four out of 5 voters shared Christie's support for the president's actions, and Sandy helped solidify Obama's decisive victory over Mitt Romney just a few days later.Today, the political landscape has shifted dramatically.