Grist: Sen. Mary Landrieu (D-La.) is running against President Obama instead of her likely Republican opponent, Rep. Bill Cassidy. Her first reelection ad of the year compiles clips of her standing up for her states oil and gas interests, attacking Obama for policies like the brief moratorium on offshore oil drilling imposed in 2010 after the disastrous BP oil rig explosion. "It`s 300,000 people that go to work every day in this industry," Landrieu intones. "You can`t just beat up on them." Implicitly...