Barack Obama has moved into a 45 percent to 45 percent tie with Hillary Clinton in Pennsylvania, according to an American Research Group poll conducted April 5-6. The margin of error is 4 points. This contrasts to the 51 percent to 39 percent lead Clinton had in its March 26-27 survey. There is a big gender gap here with Obama leading in double digits among men while Clinton leads in double digits among women. The same is true with race and age: Clinton is ahead 52 percent to 36 percent among white voters (80 percent of sample), Obama leads among black voters 89 percent to 9 percent (16 percent of sample); Obama leads 52 percent to 38 percent among voters under 49 (52 percent of sample) while Clinton leads 52 percent to 38 percent among those over 50.