The latest Rasmussen poll of likely general-election voters shows Rick Santorum trailing President Obama by 3 percentage points, which is within the margin of error, while Mitt Romney trails Obama by 6 points.  Obama leads Santorum by the tally of 46 to 43 percent.  He leads Romney by the tally of 48 to 42 percent.  The 3-day poll was taken from Tuesday (the day of the Michigan primary) through yesterday.