At a time when initial public offerings and other investment-banking business is scarce, Wall Street is all too happy to assist in rolling out a steady stream of ever narrower ETFs, notes Reilly, who formerly headed up equity compliance for Goldman Sachs.

FORBES: How To Avoid ETF Pitfalls

The brawl looks set to begin with a steady run of ads slamming Mr. Romney for his record at Bain Capital, the private-equity firm he headed in the 1980s and 1990s.

WSJ: Romney Wins New Hampshire Primary