Feb. 19 (Bloomberg) -- Bloomberg View columnist Ramesh Ponnuru presents a commentary arguing that when President Obama was himself a senator, he tried to block an up-or-down vote on the nomination of Samuel Alito to the Supreme Court -- going against what he now says the Constitution obliges. This commentary aired on Bloomberg Radio.\u0010\u0010(Ramesh Ponnuru is a Bloomberg View columnist. The opinions expressed are his own.)