Bugle sounded for 2020 White House race; no clear Trump challenger emerges

Democrats are already wrestling with questions about which candidate, strategy and approach are most likely to beat Trump on November 3, 2020

Let the 2020 White House race begin.

Tuesday's elections sounded the starting gun for a long, crowded, expensive and no doubt dramatic race for the presidency. 

Democrats, riding a wave of momentum from their gains in the US House of Representatives, enter the presidential cycle without a clear front-runner for the first time since the start of the 2004 campaign. 

More than two dozen possible contenders, including former Vice-President Joe Biden and a gaggle of senators, governors, mayors and business leaders, have been jockeying for months to line up donors and evaluate their shot at the party's nomination. 

Awaiting the