More than a month after the Obama administration issued weaker-than-expected regulations aimed at reining in abuses at some for-profit colleges, a trade association for the industry filed a lawsuit on Wednesday seeking to strike down the new rules governing excessive student debt, the Huffington Post reports. The lawsuit is a perplexing move for the for-profit college industry, which aggressively fought the Obama administration’s crackdown for more than a year, and ultimately succeeded in getting final regulations last month that were universally regarded as being substantially weakened from those proposed a year earlier…