Why do we care if China manipulates its currency in our favor?

Mark Perry has some editing fun with Harold Meyerson's article in today's Washington Post:

"This week, committees on both sides of Capitol Hill will plumb the conundrum of Chinese currency manipulation. The conundrum isn't that -- or why -- China is manipulating its currency: By undervaluing it, China is systematically able to underprice its exports, putting American (and other nations') manufacturing consumers and businesses that purchase China’ cheap imports at a significant disadvantage. The conundrum is why the hell the United States isn't doing thinks it should do anything about it.

There are certainly plenty of senators and congressmen -- and Main Street Americans U.S. producers that compete with China -- who'd like to see the White House place some tariffs taxes on American consumers and businesses who purchase the underpriced low-priced Chinese imports. If the administration doesn't act, Congress may just consider mandating some tariffs punitive taxes against American consumers and business on its own."