The high mark comes in the aftermath of Obama's re-election last week. It's Obama's best approval rating since July 1, 2009, after which the rating began steadily declining. Rasmussen also found that 47% of unaffiliated voters now approve of the president.
During the presidential campaign, Obama hit the same 54% mark in Gallup's rolling three-day average.
Obama has climbed a significant 10 points since just June, when a still-battered and bruised economy left the incumbent on the ropes against Republican challenger Mitt Romney. Obama's approval waffled around the "safe" 50% level for the last month of the campaign before finally reaching the mark steadily during the last week.