Why Would Louis Giglio Even Be Considered for Obama's Inauguration?

I haven't seen much about this in the mainstream media, which doesn't surprise me in the least, but I'm curious as to why Louis Giglio would even be considered for the Obama inauguration.

For those who don't know, this is what's been happening.

From HuffPo:

The Rev. Louie Giglio, the Atlanta pastor of Passion City Church who will deliver the benediction at President Barack Obama's inauguration, is under fire for anti-gay preaching and for calling Christians to respond to the gay-rights movement...