Because Democrats really, really want it (whatever it is - have yet to actually know what's in the 300+pages), no laws can stand in their way.
Obamacare was so good, they had to pass it in the dead of night in a rushed manner because Republicans had a chance to stop it.
The Loans to Solyndra were so important that they ignored repeated warning of the company's flawed business model and right before it finally imploded (exactly when it was predicted to, BTW), the administration had to put private investors ahead of the American taxpayers for recovery after bankruptcy, violating federal law - but they really, really wanted solar panels made in a half-billion dollar factory in Silicon Valkey to succed!
They were so sure that straw gun sales were happening along the southern border that they had to force gun shops to make the sales, so they could record them on video tape and then, inspector Clousseu-like, sit by and watch the guns slip across the border I to Mexico, with no one on the other side of the border knowing what was going on - they just really, really wanted to stop the gun sales!
The President really, really wanted to fill some vacancies I the NLRB with friends of big labor, but darn it, the Congress wouldn't go on recess - so he just decided they were in recess and made his appointments. Then the Supreme Court told him he couldn't do that, but it was too late.
See, a deeply-rooted belief that something is needed trumps all laws.