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In the southern city of San Diego, California, Democratic Mayoral candidate David Alvarez and Republican candidate Kevin Faulconer are in a dead heat leading into Tuesday's mayoral runoff election.

Alvarez, a first-term San Diego city council member, is vying to become the first Hispanic mayor in a city that is 20 percent Latino and whose close proximity to Mexico has been an integral part of its over 160-year history. The 33-year-old son of Mexican immigrants spoke to NBC Latino in December, saying he wanted to be seen as a new generation of elected officials:

"I represent a complete change – a more progressive San Diego, where we are good stewards of the environment, where we make sure that we care for our natural resources, where we make sure that we are partnering with our schools and where we are focused on job creation,” Alvarez said.

He has received strong support - and millions of dollars - in support from unions, and high-profile Latino legislators, such as San Antonio Mayor Julian Castro, have campaigned for him. Alvarez was recently endorsed by President Obama.

The 47-year-old Faulconer has received millions of dollars from business groups, and has been endorsed by former City Treasurer Mike Aguirre. Faulconer has stressed he is a moderate Republican, and downplayed Obama's endorsement of Alvarez.

"I've been so proud of our San Diego endorsement,” he said. “From the very beginning, my campaign has been supporting San Diegans, and they want a mayor that's supported by San Diegans."