TV ratings continue to shrink for the Republican presidential debates. Is that any surprise? Nineteen, count them 19, debates have been staged so far, not including informal candidate forums. How many more of these Newt Gingrich and Mitt Romney verbal showdowns can viewers stand? After peaking at 7.6 million viewers for a debate Dec. 10 on ABC, audiences mostly have been on the decline. The Jan. 26 debate from Jacksonville, Fla., reached 5.4 million viewers on CNN. However, the network isn’t complaining. That’s well above its 735,000 daily average. Sen. John McCain, R-Arizona, is among those who want to see the debates end. He said they have turned into mud-wrestling contests and are driving up negative impressions of the party’s candidates. Fortunately, viewers will get a break this month. The next debate isn’t scheduled until Feb. 22 from Mesa, Ariz.