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Update: Peña's Proposed District a Toss-Up?

Last year, after the Republicans won large majorities in the Texas House, state Rep. Aaron Peña of Edinburg left the Democrats to join the GOP. Is he now being rewarded with a district that a Republican can maintain? Check out these maps.

A proposal by Rep. Burt Solomons, R-Carrollton.

As state Sen. Kel Seliger said last week, the decennial process of drawing the boundaries around legislative districts is inherently political, a fact that's apparent by looking at the maps themselves.

Take the case of state Rep. Aaron Peña, R-Edinburg, who followed his 2010 election as a Democrat last year by switching to the GOP, which now has the largest majority for either party since 1983.

In the statewide map proposed by the House's redistricting chair, Rep. Burt Solomons, R-Carrollton, Peña's district is redrawn to boost his chances for re-election as a Republican in Democrat-friendly Hidalgo County. First, this map shows current districts in the Rio Grande Valley. Peña is the lone Republican.

Here's the proposed change. Notice the new district drops the northern, rural and sparsely populated portions of Hidalgo County, and the Sullivan City area in the far southwest corner along the border with Starr County and Mexico.

This thematic map shows voting tabulation districts — the U.S. Census Bureau's version of a precinct — in Hidalgo County, and how they voted in the 2010 governor's race. Darker shades represent stronger supoort for the Republican in the governor's race. See how Peña's proposed district now captures the more Republican-leaning areas.

The two voting districts in the far northwest portion of the county lean Republican, but they contain few voters. This map shows the raw vote totals for both parties during the 2010 governor's race. Look at the GOP vote map again in the context of Peña's current and proposed districts. You'll see he traded high raw vote areas that lean Democratic in favor of those that lean Republican:

His district is also now changed demographically. The current district is 94 percent Hispanic. The proposed boundaries would lower that to 76 percent. Hidalgo County as a whole is 90 percent Hispanic, according to the census count.

Will it work, assuming these boundaries don't change? We'll see. In the end, it's a numbers game. Peña's current district voted 76 percent for Bill White, the Democrat who lost the governor's race against Gov. Rick Perry. The governor won the proposed district with 50.1 percent of the vote.

Update (2:30 p.m.): In an interview, Peña said he didn't have a hand in drawing the map, but isn't surprised by its boundaries: “I fully expected that there would be an attempt to maximize a Republican seat,” he said. “It is logical assumption.”

He said he plans to win no matter the makeup of the district, but noted that the proposed version was "more competetive" given his party switch: “In the end, people are going to have a choice. That was my objective in switching parties,” he said. “My area has increasing been dominated by a corrupt political machine. There needs to be a choice. I did that for my constituents.”

Go here to download all the data used to make these maps. Let us know if you have feedback or ideas for other data-related content, and be sure to follow @TribData on Twitter for updates.

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Demographics Immigration State government Kel Seliger Redistricting Texas Legislature U.S. Census Bureau