You're on the right track.  There are a small handful of tweaks you needed 
to make it work for your use case, but they're fairly minor: 
http://jsfiddle.net/asgallant/HU56R/1/

On Saturday, December 8, 2012 10:46:56 PM UTC-5, J.J. Gallagher wrote:
>
> Great… I tried to adapt this to the geomap. I believe I would just have to 
> swap out the code for the bar chart for the code to draw the geomap, but I 
> think it needs additional tweaking. 
>
> Does  it look like I'm on the right track?
>
> http://jsfiddle.net/jayjgal/HU56R/
>
>
>
> On Dec 8, 2012, at 9:55 PM, asgallant <[email protected]<javascript:>> 
> wrote:
>
> Ahh, ok, what you need is a category 
> filter<https://developers.google.com/chart/interactive/docs/gallery/controls#categoryfilter>for
>  the year.  The data set is a bit more complicated, but if you like the 
> look of the category filter, I wrote a hack that turns one into a column 
> selector: http://jsfiddle.net/asgallant/WaUu2/
>
> On Saturday, December 8, 2012 12:50:30 PM UTC-5, J.J. Gallagher wrote:
>>
>> Thanks... yes I'm looking to do something similar here. 
>>
>> I put together a static version below. This template can only handle one 
>> column of data at a time, but I entered the two I want to work with. I only 
>> entered the data for two states so far because I'm sure it will have to be 
>> changed. I want to look at two datasets, Latino population and Eligible 
>> Latino voters, over 4 periods of time: 2000, 2004, 2008 and 2012. 
>>
>> So there would be two controls, one for year, and one for the data, that 
>> would simply repopulate the map with the selected time and dataset.
>>
>>
>> http://savedbythegoog.appspot.com/?id=1b44d060ddb9a64936cc23efd138dcf4fa44ed2e
>>
>> On Friday, December 7, 2012 11:31:45 PM UTC-5, asgallant wrote:
>>>
>>> It might help to build the chart with static data first, and once you've 
>>> got that working, figure out how you would like to apply the control(s) to 
>>> it.  In that example, the data is aggregated over the selected time period 
>>> and displayed in the GeoChart - is that what you are trying to do here?
>>>
>>> On Friday, December 7, 2012 9:56:39 PM UTC-5, J.J. Gallagher wrote:
>>>>
>>>> Hi - I apologize if the answer to this is obvious... I am looking to 
>>>> apply a control to a geomap, or a geochart to display various datasets 
>>>> over 
>>>> time. I looked at adapting some of the code listed in the playground under 
>>>> dashboards and controls, but have not have had success. I also looked at 
>>>> adapting this code: http://jsfiddle.net/asgallant/Fs3Hb/ but can't get 
>>>> it running 
>>>>
>>>> Could someone point me in the right direction?
>>>>
>>>> Thanks very much 
>>>>
>>>>
>>>>
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