how to submit checklist in Django with GET

Hi I have on my html file this, tags and tagInfos are both queryset´s of Django, that 2 for´s are only to show wich one belongs to the other:

<form action="/chart/chart/" method="get">
    {% if tags.count > 0 %}                     
        {% for tag in tags %}
            {% for tagInfo in tagInfos %}
                {% if tag.taginfo_idtaginfo1_id == tagInfo.idtaginfo %}
                    <!--
                    <div>
                        <h3><a href = "/tags/get/{{ tag.idtag }}/"> {{ tagInfo.nome}} </a></h3>
                        Datasource: {{ tag.datasource_idestacao_meteo }}            
                    </div>
                    -->         
                    <p>
                        <input type="checkbox" name="checks[]" value="{{ tag.idtag }}" />
                        <a href = "/tags/get/{{ tag.idtag }}/"> {{ tagInfo.nome}} </a>
                        Datasource: {{ tag.datasource_idestacao_meteo }}
                    </p>

                {% endif %}
            {% endfor %}
        {% endfor %}

        <!--To submit the chart creation-->         
            {% csrf_token %}            
            <button type="submit" class="btn btn-primary">Submit creation</button>          
    {% else %}
        <p>None TAG to select.</p>      
    {% endif %}
    </form>

So and on my view i try to do that:

def chart(request):
if 'checks' in request.GET and request.GET['checks']:
    chosen = request.GET.getlist('checks')
    return render_to_response('Chart/chart.html',
            {
            'chosen' : chosen,              
            }
        )
else: 
    return render_to_response('Chart/chart.html',
            {

            }
        )

But don´t show any of the selected checkboxes on the other html, I´m using {{ chosen }} to show.

Any ideas of what I´m doing wrong?