The Gallup daily tracking poll now has Hillary Clinton and Barack Obama in a statistical tie, with Obama at 48 percent and Clinton at 47 percent. The survey was conducted April 22-24 and has a margin of error of 3 percent. Obama had recently been ahead by as much as 10 points and Gallup suggests that Clinton’s uptick is due to the impact of her Pennsylvania primary victory. Just to note: a number of pre-Pennsylvania polls by major organizations had Obama with significant leads, and at times, the Gallup daily tracking poll has been at variance with them and even with the poll Gallup conducts for USA Today.