Republican and Democrat members of the Senate Banking, Housing and Urban Affairs Committee were at odds during a hearing this week over whether there is much of a liquidity problem in the fixed-income markets today, and if so, to what extent the Dodd-Frank Act or Federal Reserve monetary policy may be responsible. Federal regulators, on the other hand, told the lawmakers that markets are functioning well enough and still evolving in a new, post-crisis environment. They suggested the thing to worry about is how much liquidity there will be in five or 10 years and how it will function. Sen. Dean Heller, R-NV, asked...