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net gain of 23 seats. for the democrats to hold onto power they would now need to win all 26 toss-up races. the best case scenario for democrats right now not so great. a small majority for republicans. the best case for house republicans 249 seats to democrats 186. that's the kind of shift which could be very meaningful. >> it's clear that republicans have the political-momentum one week before election day. biden districts are moving in the lean republican category. >> the govern majority for republicans. not a squeaker night where then you have to find a couple democrat votes to p...

>> races in georgia, arizona, nevada and pennsylvania for the senate are toss-ups. chief washington correspondent mike emanuel has more from d.c. >> good morning. the republican map expands significantly in this fox news power rankings forecast. in new york where crime is the number one issue. new york's fourth district on long island republican candidate anthony esposito, his race against former supervisor shifts from lean democrat to toss-up. west coast california's 27th district in northern l.a. county is shifting. mark garcia is facing christie smith. it was a toss-up. now the projection i...