Associated PressLawyers for U.S. Sen. Lisa Murkowski's campaign want Alaska broadcasters to refuse a national Tea Party ad.The campaign says the TV ad is "littered with lies and intentional mischaracterizations."Attorney Timothy McKeever, in a letter sent to broadcasters Monday, said stations are under a "legal and moral obligation" not to air it.The Tea Party Express ad - also unveiled yesterday - is entitled "Arrogant Lisa Murkowski - You Lost!"A Tea Party Express spokesman, Levi Russell, says the group stands behind the ad.Download Audio (MP3)