Ruth Marcus:

The symmetry of sin is suddenly looking more equal. Last week, I flayed John McCain for dishonesty — flagrant and repeated dishonesty — about Barack Obama’s proposals. Obama was by no means blameless, I argued, but his lapses were nowhere near as egregious as his opponent’s. I stand by everything I wrote. But a series of new Obama attacks requires a rebalancing of the scales: Obama has descended to similarly scurrilous tactics on the stump and on the air. On immigration, Obama is running a Spanish-language ad that unfairly lumps McCain together with Rush Limbaugh — and quotes Limbaugh out of context. On health care, Obama misleadingly accuses McCain of wanting to impose a $3.6 trillion tax hike on employer-provided insurance. Obama has been furthest out of line, however, on Social Security, stooping to the kind of scare tactics he once derided.