FRANKFORT — Libertarian David Patterson has announced his intention to run for U.S. Senate in Kentucky.A 42-year-old Harrodsburg police officer, Patterson said in a statement that he's making a bid to unseat Senate Republican Leader Mitch McConnell because voters are looking for an alternative. (Related: WFPL's coverage of the 2014 Senate race.)Ken Moellman, chairman of the Libertarian Party's state executive committee, said he's pleased Patterson wanted to get into the race. Patterson will seek the party's nomination in an internal primary on March 1.McConnell is seeking a sixth term in office in next year's election. His chief rival is Democratic front-runner Alison Lundergan Grimes, Kentucky's secretary of state.