Fiscal Cliff Deal Passed By Congress After Republicans Cave

You mean commenters? 

Two reasons:  

Most here at HP who are dancing are political operatives paid to post positive and upbeat accolades, to create the impression that Democratic politicians are working in the 99%'s interest.  I'll post a comment after this with links for how this works.

Others are like sports' fans, who see political parties like their favorite sports teams, and cheer whatever they do.  

I'm an old OLD liberal Democrat who has never voted for a Republican and never will.  But I can't imagine ever voting for another Democrat again.  It's like Coca-Cola and Pepsi at this point - The same, different brand.

Ask yourself why so many Republican voters post happily at what Republicans achieve?  It's certainly not in their interests (unless they're filthy rich, one of the 1%).  
Read the Article at HuffingtonPost