The latest polling of likely voters from Rasmussen Reports shows Mitt Romney with 50 percent support for the first time this fall, and with a 4-point lead over President Obama (50 to 46 percent) — his biggest of the fall. Romney now leads by 9 percentage points among independents.  The poll was taken (almost entirely) before the third and final presidential debate.  It marks the first time that either candidate has hit 50 percent support in Rasmussen’s polling this month.  It also marks Obama’s low-water mark for the month.