Les Abend, a CNN aviation analyst, also suggested on CNN's "Anderson Cooper 360" that low temperatures in New York could have made the runway near freezing, complicating the landing.
Plane carrying Mike Pence skids off runway - CNNPolitics.com
Looks like the accident occurred around 2340Z.
METAR KLGA 272251Z 09009KT 3SM RA BKN009 OVC015 13/11 A3014 RMK AO2 SFC VIS 4 SLP205 P0014 T01330106 $
METAR KLGA 272351Z 10010G15KT 3SM RA BR OVC010 13/12 A3010 RMK AO2 SFC VIS 4 SLP192 P0032 60061 T01330117 10139 20072 58018 $