Mortgage originations might be down this year, but private-label issuance of mortgage-backed securities is going strong – and the GSEs are apparently doing their best to tag along for the ride. According to data gathered by Inside MBS & ABS, an affiliated newsletter, $115.2 billion in non-agency MBS was issued during the first half of this year that was apparently carved up for GSE purchase. That marks a 53.5 percent jump from the $75.1 billion…