Money is gushing into New Hampshire as presidential candidates see the first primary as a make-or-break moment.
About US$100 million ($150 million) has already been poured into broadcast and cable television ads courting voters for next Wednesday's vote, according to estimates from Kantar Media's CMAG and an analysis by Ken Goldstein, a Bloomberg politics analyst and University of San Francisco professor.
In comparison, about US$2 million ($3 million) had been spent in New Hampshire by this point in the 2012 race.
The spending in New Hampshire shows how American politics is being transformed by US Supreme Court decisions in recent years that cleared the path for unbridled spending in elections. The sheer number of candidates and the lack of an incumbent has also intensified the flow of money. The surge also comes from rising prices. While federal election laws guarantee low advertising prices for campaigns, outside groups like super-PACs have to pay a market rate. For the same spot, super-PACs have been known to fork out as much as seven times more than a candidate's official campaign committee.
So far, the vast majority of New Hampshire ad spending - about 80 per cent as of February 2 - has come from the Republican candidates and outside groups supporting them. Even Donald Trump, who rode a wave of free publicity through the early months of his campaign, began TV advertising in early January.